Commit 3eb906c6 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
Browse files

powerpc: Make cpu_to_chip_id() available when SMP=n 



Up until now we have only used cpu_to_chip_id() in the topology code,
which is only used on SMP builds. However my recent commit a4da0d50
"Implement arch_get_random_long/int() for powernv" added a usage when
SMP=n, breaking the build.

Move cpu_to_chip_id() into prom.c so it is available for SMP=n builds.

We would move the extern to prom.h, but that breaks the include in
topology.h. Instead we leave it in smp.h, but move it out of the
CONFIG_SMP #ifdef. We also need to include asm/smp.h in rng.c, because
the linux version skips asm/smp.h on UP. What a mess.

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent c6102609

arch/powerpc/include/asm/smp.h

+1 −1
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ extern int boot_cpuid; 
extern int spinning_secondaries;



extern void cpu_die(void);

extern int cpu_to_chip_id(int cpu);



#ifdef CONFIG_SMP
@@ -112,7 +113,6 @@ static inline struct cpumask *cpu_core_mask(int cpu) 
}



extern int cpu_to_core_id(int cpu);

extern int cpu_to_chip_id(int cpu);



/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.

 *

arch/powerpc/kernel/prom.c

+20 −0
Original line number Diff line number Diff line
@@ -777,6 +777,26 @@ int of_get_ibm_chip_id(struct device_node *np) 
	return -1;

}



/**

 * cpu_to_chip_id - Return the cpus chip-id

 * @cpu: The logical cpu number.

 *

 * Return the value of the ibm,chip-id property corresponding to the given

 * logical cpu number. If the chip-id can not be found, returns -1.

 */

int cpu_to_chip_id(int cpu)

{

	struct device_node *np;



	np = of_get_cpu_node(cpu, NULL);

	if (!np)

		return -1;



	of_node_put(np);

	return of_get_ibm_chip_id(np);

}

EXPORT_SYMBOL(cpu_to_chip_id);



#ifdef CONFIG_PPC_PSERIES

/*

 * Fix up the uninitialized fields in a new device node:

arch/powerpc/kernel/smp.c

+0 −16
Original line number Diff line number Diff line
@@ -597,22 +597,6 @@ out: 
	return id;

}



/* Return the value of the chip-id property corresponding

 * to the given logical cpu.

 */

int cpu_to_chip_id(int cpu)

{

	struct device_node *np;



	np = of_get_cpu_node(cpu, NULL);

	if (!np)

		return -1;



	of_node_put(np);

	return of_get_ibm_chip_id(np);

}

EXPORT_SYMBOL(cpu_to_chip_id);



/* Helper routines for cpu to core mapping */

int cpu_core_index_of_thread(int cpu)

{

arch/powerpc/platforms/powernv/rng.c

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <asm/io.h>

#include <asm/prom.h>

#include <asm/machdep.h>

#include <asm/smp.h>





struct powernv_rng {

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